olson



C. G. OLSON.

GEAR TESTING MACHINE.

APPucATloN man 1AN.23,1919.

1,304,592', Pated 'May 27, 1919.

2 SHEETS-SHEET 1.

C. G. OLSON.

@EAIITESIING MACHINE. APPLICATION FILEDl IAN. 23. ma.

Patented May 27, 1919.

2 SHEETS-SHEET 2.

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CARL G. OLSON, 0F CHICAGO, ILLINOIS, ASSIGNOR TO ILLINOIS CHICAGO, ILLINOIS, A

CORPORATION OF ILLINOIS.

Toor. WORKS, or

GEAR-TESTING lMACHINE.

' Specification of Letters latent.-

Patented May 27, 1L919.

Application led January 23,1919. Serial No. 272,606.

To all whom t may concern e it known that I, CARL G. OLSON, a citizen of the United States, residing at Chicago,vin the county of Cook and State of Illinois, have invented a certain new and -useful Improvement in Gear-Testing Machines, of which\ the following is a specilication.

My invention relates to testing machines and the object of the invention is to provide a machine adapted to test the accuracy of the teeth of involute gears, and to indicate the degree of aberration or inaccuracy of the teeth in case any exists. In accomplishing this object I have originated certain elements and combinations of elements which are illustrated in the accompanying drawings in which` Figure 1 is a side elevation of the machine, chiefly in central section. Y I; ig. 2 is a front elevation of thev machine, an

Fig. 3 is a front elevation of certain of the i coperating elements in changed position.

Like numerals denote' like parts through- Y out the several views.

In the form shown in the accompanying drawings the machine has an upright main frame 1 having a horizontal track 2 at the p for supporting the roller 3. The main frame has vertically arranged guides 4, 4 for guiding the cross head 5. This cross head carries a horizontally arranged stud 6 at the back which forms a pivot for the rocker arm 7.. The function of the rocker arm is to cause the roller to travel in a predetermined patin upon the track, and while the details may be varied I have shown a form in which the rocker arm has a housing l0 at its upper end supporting` ball bearings 11 in which an arbor 12 is journaled. Screw caps 13, 13 screw into opposite ends'of the housing for rendering the lball bearingsdust proof. The roller is fastened to the arbor 1n such manner as to cause the arbor to rotate in its bearings as the roller rolls upon the track. On either side of the roller are spacing collars 15, 16, the latter forming an abutment for the gear 17 which is to be tested. Said gear is clamped into position by means of a nut 19 screwing on the threaded forward end of the arbor, and abutting the collar 20 which in turn abuts the hub of the gear. .The gear is thus rigidly clamped gear.

Yto the' roller and moves in unison with it.

he gear, and if desired the gear and roller,` maybe removed by simply removin the nut 19 and the collar 20 and Slipping t em and the gear and roller and collar 16 off over the forward end of the arbor.

A handle 22 is preferably formed integral with the rocker arm 7 for affording means whereby the to roll Iback and forth along the track.

At the front of the mach1ne there is a contactor 25 havinga head 26 for engaging the acting surface of the tooth being tested. Said operator may cause the roller head comes level with the surface of the track, the latter forming an analogue of a tangent to the base circle of the gear.. The roller is analogous to the base circle of' the The contactor is pivotally mounted upon a stud 28 supported at the ,upper end of a panel 29. Said panel is rigidly fastened to a carriage 30 which travels in horizontalA ways 31, 31 near the upper end of the main frame. The position of the trolled by adjusting screws 32, 32.

The contactor has an extension 35 which descends to a point. near the bottom of the machine where it is provided with a pin 36 extending forward through a suitable aperture 37 in panel 29 and into a slot 39 formed in the pointer 40. Said pointer is fulcrugmed upon a stud 42, screwing into thepanel at a carriage is conpoint slightly belo-wpin 36. The pointer eX- tends upward'almost to the level of stud 28 where a scale 45 is marked Aupon the front surface of the panel. Thus any lateral movement of the lower end of the contactor is transmitted to the pointer and the leverages are such that the movement of the free end of the pointer will be greatly amplified. By

this construction an amplification of to 1 may be readily obtained.

`Means are provided for yieldingly holding the contactor in acting surface of the tooth. These are shown at the lowerend of the panel, and consist of a double spring 50, which is fastened to the.u

panel by means. of a screw 51 and passes to the two sides of the pointer 40. A pin 52 is rotatablyv mounted in thev panel between screw 51 and the lower end of the pointer. It is provided with a linger 53 which lmay be thrown into engagement `with one side or the other of the spring. yThis causes the spring to press upon one side or the other of engagement with the the pointer, and when it is desired te have the spring press the pointer toward the left the finger is thrown toward the left. which brings the right branch of the spring into engagement with the right side of the pointer, at the same time holding the left branch of the spring out of engagement with the leftside of the pointer. By employing this expedient the contacter may be caused to press toward the left for engaging one side of a tooth, or to the right for engaging the other side of the tooth. Stop pins 55, 55 are placed on the panel near the ends of the scale for limiting the distance te which the pointer may swing.

Operation: When a gear is to be tested, a roller 3 is selected which will have the same diameter as the base circle of the gear. The gear is then secured to the gear carrier and the carriage 30 is adjusted until the contacter is in central position when in engagement with the acting surface ef thetooth to be tested. This posit-ion is illustrated in Fig. 2. Under these conditions pointer 40 will, of course, also be at central position. v'When the machine is thus adjusted the operator grasps the handle Q2 and slowly moves i in a direction to ultimately move the engaged tooth away from the centactor. Thus, in practice, if the contacter engages the right side of the tooth as in Fig. 2 the operator moves the gear carrier in a direction causing the roller to roll toward the left as in Fig. 3. New, according to the theory of involute gears, if the tooth is perfect it will not cause any lateral movement of the contacter as the gear rolls away. But if the tooth is imperfect, the head of the contacter will be caused to move in one direction or the other, which will produce a corresponding but greatly magnified movement at the free end of the pointer. Thus the operator is able to readily detect any imperfections in the formation of the tooth.

It will be seen that my device affords a simple and yet highly sensitive means for testing invelute gears. Gears of various pitch diameter may betested without changing anything except the size of the roller. If a roller of larger diameter is required the gear carrier automatically accommodates itself to it, for the larger roller will simply cause the cross head 5 to ride at a higher level in the machine. Conversely, a smaller roller will cause the cross head to ride at a lower level. As the parts are comparatively few in number and simple in configuration the machine .is durable and comparatively' simple te manufacture.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, isz- 1. Gear testing apparatus having a centactor and means including a plane surfaced track, a roller adapted to roll on said track,

and means supported by the roller and adapted to impart a rolling movement te the gear to be tested while one of the teeth ef said gear remains in engagement with thel contacter, to thereby cause the contacter to move in case the tooth is out of true.

Gear testing apparatus having a meinber with a plane surface and a movable contacter adjacent thereto, a roller adapted to roll on said plane surface, and having a diameter corresponding to the pitch diameter of the gear to be tested, and means for mounting such gear concentric with said roller, se as to turn therewith, with one of its teeth in engagement with the contacter, te thereby cause the contacter to move in case the tooth is out of truc.

3. A gear testing device having a con taeter, a rolling gear carrier for holding the acting surface of a gear tooth in engagement with the contacter, a track upon which the gear carrier rolls, a pointer, and amplifying connections between the contacter and the pointer for exaggerating the amount of displacement of the contacter, if any.

l. In a gear testing machine, the combination of a gear carrier including a roller, and means fer rolling it; a track for the roller; a contacter having an acting head opposite to the peint of tangency ef the roller on the track; and means for indicating the degree of displacement of the contacter, if any.

In a gear testing machine, the combination of a gear carrier including a roller, and means for rolling it; a track for the roller; a contacter having an acting head opposite to the point of tangent-y of the roller on the track; an indicator: and compound levers connecting the contacter with the indicator for amplifying the displacement ef the contactor, if any.

6. A gear tester having a contacter.. means including a roller and track fer rolling the gear wheel relatively thereto with one of its'teeth in engagement with the contacter, and means for yieldingly holding the contactor in normal position.

7. A gear tester having a contacter, means including a roller and track for rolling the gear wheel relatively thereto with one of its teeth in engagement with the contacter, an indicator connected to the contacter, and spring mechanism tending to hold the indicator cent-ered.

8. A gear tester having a contacter, means including a roller and track for rolling the gear wheel relatively thereto with one of its teeth in engagement with the contacter, an indicator connectedto the contacter for indicating the amount of displacement of the contacter, if any, a scale opposite to the indicator, and means yieldingly tending to hold the indicator centeredvwith respect to the scale.

9. A gear tester having a main frame, a

- allel to the tangent of thereby position the i track formed thereon, a roller on the gear ,carrier rolling thereon, a contactor for engaging the Working surface of the gear teeth, and a carriage mounted on the main frame for supporting the contactor, usaid carriage being movable in a direction parthe pitch circle of the gear for positioning the contactor relatively to the gear teeth. e

l0. A gear tester having a main frame, a gear carrier rolling thereon, a carriage traveling thereon in a direction parallel to the tangent of the pitch circle of the gear, a contactor articulately mounted upon` the carriage, means on the carriage for normally holding the contactor and means for adjusting the position of the carriage relatively to the main frame to contactor relatively to the tooth to be tested.

11. A structure as specified in claim 10 in Which there is a scale mounted on the carriage and a pointer adapted to coperate therewith, the pointer being connected to the contactor for indicating on the scale the amount of displacement of the contactor, if any.

12. A gear tester having a main frame, a track, a gear carrier supported by the roller, means for causing the roller to roll upon the 'track in a predetermined path, a contactor, and means for supporting said contactor and adjusting it to the acting surface of the toothV being tested.

13. A gear tester having a main frame, a track formed thereon, a roller on the track, a gear carrier supported by the roller, means for causing the roller to roll upon the track in a predetermined path, a contactor, a carriage traveling on the main frame and adapted to support the contactor, and means for .adjusting the carriage to bring the conin normal position,

' pointer mounted tactor into engagement With the surface of the tooth to be tested.

14. A gear tester having a main frame, a track mounted thereon, a roller on the track,

ya gear carrier supported by the roller, a Y

along rocker arm for advancing the roller the track, a cross head guided by the main frame, the rocker arm being pivoted to the crosshead for guiding the roller on the track, and a contactor mounted on the main frame in position to contact the acting surface of one of the teeth of the gear to be tested. v

15. A gear tester having a main frame, a track mounted thereon, a roller on the track, a gear carrier supported by the roller, a rocker. arm for advancing the` r'oller along the track, a cross-head guided by the frame, the rocker arm being pivoted to the crosshead for guiding the roller on the track, a contactor, a carriage mounted on the main frame for supporting the contactor, a

on the carriage and actuated by the contactor for registering the aberration, if any, of the tooth being tested.

main 4 16. A gear tester having a main frame,

aV track mounted thereon, a roller on the track, a gear carrier supported by the roller,

cani; e. oLsoN. i f 

